@book
{TN_libero_mab2,
author = {
Classen, Johannes
},
title = {
Vorlesungen über moderne Naturphilosophen
(Du Bois-Reymond, F. A. Lange, Haeckel, Ostwald, Mach, Helmholtz, Boltzmann, Poincaré und Kant)
},
publisher = {Boysen},
year = {1908},
address = {
Hamburg
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}